A big plus to deisels:
The more clean minded diesel owners out there, the more the US will focus on biodiesel. Sure, the exhaust smells like hamburgers, but there are no, repeat NO sulfates in a pure biodiesel engine. Though, most biodiesel users mix with regular diesel, this is not needed. The University I attend uses biodiesel in every diesel burning vehicle they own. Personally, I own an HCH-II, but would seriously consider getting a diesel VW or most definitely a diesel Accord if biodiesel were made readily available.